CS
31HB.27 Strength and proof of strength
ED Decision 2011/013/R
(a) The structure must be able to support limit loads without permanent deformations or other detrimental effects.
(b) The structure must be able to withstand ultimate loads for at least 3 seconds without failure.
(c) For the balloon envelope, proof of strength must also make allowance for tear growth after damage of the envelope in order to prevent propagation of a tear to a hazardous size. (See AMC 31HB.27(c))
(d) The basket must be of a generally robust design and afford the occupants adequate protection during a hard or fast landing. There must be no design feature that by reasonably envisaged distortion or failure would be likely to cause serious injury to the occupants. (See AMC 31HB.27(d))
(e) The design and strength of components (particularly the burner frame/load frame) must also consider the effects of recurrent and other loads experienced during ground handling and transportation. (See AMC 31HB.27(e))
(f) The effect of temperature and other operating characteristics that may affect strength of the balloon must be accounted for.
(g) Each
item of mass that could cause an unsafe condition if it broke loose must be
restrained under all loads up to the ultimate loads specified in this
paragraph. The local attachments in the load path between the restrains and
the structure should be designed to withstand 1.33 times the
specified ultimate loads (See AMC
31HB.27(g)):
-
Horizontal
6.0g,
-
Downward
6.0g,
-
Upward
2.0g.
[Amdt No.: 31HB/1]
Balloons must withstand limit loads without deformation and ultimate loads without failure. Envelope strength must account for tear propagation. Baskets require robust design for occupant protection during landing. Component strength must consider ground handling and temperature effects. Loose items must be restrained under ultimate loads with reinforced attachments.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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